chore: migrate authifier into codebase (#658)

Co-authored-by: izzy <me@insrt.uk>
Signed-off-by: Zomatree <me@zomatree.live>
Signed-off-by: izzy <me@insrt.uk>

crates/core/models/Cargo.toml

@@ -41,6 +41,7 @@ iso8601-timestamp = { workspace = true, features = ["schema", "bson"] }
 # Spec Generation
 schemars = { workspace = true, features = ["indexmap2"], optional = true }
 utoipa = { workspace = true, optional = true }
+serde_json = { workspace = true }
 
 # Validation
 validator = { workspace = true, features = ["derive"], optional = true }